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      <td width="304" height="25" valign="top"><div align="left"><span class="style6">现代工程制图习题及参考答案</span></div></td>
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      <td width="416" height="30" valign="middle" class="style1 style7"><div align="center">3-1. 根据直观图，徒手完成集合体的三视图。</div></td>
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